纵向分辨力（）。
A.取决于改善聚集带
B.取决于TGC（STC.的斜率
C.通过DSC而改善
D.可通过提高探头频率改善
E.通过声透镜改善
参考答案：D
-How often does your daughter watch TV?
- __________. [ ]
A. once time a week.
B. Twice a week.
C. Twice times a week
D. Third time a week.
流行性出血热的三大主症是（）。
A.发热、出血、腓肠肌疼痛
B.发热、出血、皮疹
C.发热、出血、肾损害
D.发热、出血、昏迷
E.发热、出血、低血压
daughter watch TV?